Sump Pump Maintenance Checklist: Getting Basement-Ready for Spring Thaw

Spring thaw and heavy rainfall regularly test basement waterproofing across Durham Region, and a sump pump is your last line of defence against a flooded basement. A pump that hasn't been checked since last year is a risk you don't want to discover mid-storm. Here's a checklist to run through before the thaw hits.

1. Test the pump manually

Pour a bucket of water into the sump pit until the float rises enough to trigger the pump. It should kick on automatically, remove the water quickly, and shut off cleanly once the pit is empty. If it hesitates, struggles, or doesn't trigger at all, that's your first sign something needs attention.

2. Check the float switch

The float switch is what tells the pump when to turn on. Make sure it moves freely and isn't caught against the side of the pit or tangled in the power cord — a stuck float is one of the most common reasons a sump pump fails to activate when it's needed.

3. Clear the inlet screen and pit of debris

Sediment, gravel, and debris can accumulate in the sump pit and clog the pump's inlet screen, reducing its efficiency or causing it to jam. Clean out the pit and make sure nothing is obstructing the pump's intake.

4. Inspect the discharge line

Follow the discharge pipe from the pump to where it exits the home and make sure it's clear, properly connected, and directs water well away from the foundation. A blocked or improperly angled discharge line can send water right back toward your basement.

5. Confirm the check valve is working

The check valve prevents water in the discharge pipe from flowing back into the pit after the pump shuts off. A failed check valve forces the pump to work harder and cycle more often than it should, shortening its lifespan.

6. Don't skip the battery backup

Most basement floods happen during storms — when power outages are also most likely. A battery backup sump pump activates the moment your primary pump loses power, giving you 24 to 72 hours of protection. If you don't have one, spring is a good time to add it; if you do, confirm the battery still holds a charge.